World's Largest Offshore Wind Farm Seen From Space

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Giant wind turbines appear as white specks across the Thames
Estuary in the United Kingdom, in this satellite photo of the
London Array, the world's largest offshore wind farm, released
today (Jan. 21).

The wind farm, which became operational on April 8, 2013, is
located 12 miles (20 kilometers) from England's Kent and Essex
coasts. The London Array's 175 wind
turbines can generate a maximum of 630 megawatts of power,
which is enough to power 500,000 homes, according to NASA
officials.

The Landsat 8 satellite, operated jointly by NASA and the U.S.
Geological Survey, captured this image of the London Array on
April 28, 2013. The white dots visible in the photo are wind
turbines, and the wakes of several boats can also be seen.
[ Earth
from Above: 101 Stunning Images from Orbit ]

Tan-colored sediment swirls through the waters of the Thames
Estuary, located where the River Thames meets the North Sea. The
sediment is runoff washed out by the River
Thames, NASA officials said.

The London Array's wind turbines are spread out across 40 square
miles (104 square kilometers), each positioned to harvest the
prevailing southwest wind. The turbines are separated by roughly
2,100 to 3,900 feet (640 to 1,200 meters), and stand 482 feet
(147 m) tall. Cables buried beneath the seafloor connect the wind
turbines and transmit power to two offshore substations and one
onshore station, according to NASA officials.

The London Array's wind turbines sit on two natural sandbanks,
where water can reach depths of 80 feet (25 m). This site in the
Thames Estuary was chosen because of its proximity to onshore
power grids and because it does not disrupt shipping lanes that
cut through the area.

Construction of the next phase of the London Array is currently
in progress, and the wind farm is expected to eventually grow to
cover 95 square miles (246 square km).

The London Array has been heralded as a way to reduce annual
carbon dioxide emissions in the United Kingdom. Officials
involved with the project say the wind farm could reduce carbon
dioxide emissions by 900,000 tons, which is equivalent to the
emissions of about 300,000 automobiles.

But, those critical of the London Array have expressed concern
over the
wind farm's impact on wildlife in the area, including
red-throated divers and other bird species.